* {
    padding: 0;
    margin: 0;
    list-style: none;
    box-sizing: border-box;
}

.box {
    width: 100vw;
    height: 100vh;
    display: flex;
    flex-direction: column;

    header {
        height: 300px;
        // background-color: pink;

        .one {

            column-count: 3;

            ul {
                column-count: 3;

                li {
                    width: 160px;
                    text-align: center;
                    height: 40px;
                    line-height: 40px;
                    background-color: #fff;
                    margin: 20px 10px;
                    border-radius: 50px;
                    border: 1px solid black;
                }
            }

            .active {
                background-color: #1E6FFF;
                color: #fff;
            }

        }
    }

    main {
        flex: 1;
        height: 100%;
        overflow-y: scroll;

        .two {
            ul {
                li {
                    display: flex;
                }

            }

        }
    }


}